Building Angles in KSP?

[Nutone]

Hey guys, Sorry if this is an obvious question, but currently I am working on a rover that I would like to have a slanted cover over the top using metal plates under the "Structural" Tab. The closest i can get to is in 'angle snap mode, but it tilts around the plate's node wrong and I cannot get it to work the way I would like. I also have ideas like MaceyDean's (youtube) "Vulture" but these Ideas are impossible to achieve if I cannot get them to snap right. Does anyone have any pointers to how I can get it to snap in a way like the picture?

TL:DR -- I need help finding angle snaps on objects so that I can create a greater variety of ideas. Can anybody help me?

[drlambnz]

Mod + w,a,s,d,q,e rotate the object by 5 degrees, I believe. The key for Mod varies between Windows, Apple, and Linux, but on Windows it's Alt, if that's any help. Hope that answers your question

[Johnno]

Shift actually, for rotating parts in VAB/SPH.

Edit: Holding Alt (if you're using windows) and clicking an item/group will copy it, handy to use with symmetry.